When I was in undergraduate school, my advisor (whose specialties were Daoism, tantric Buddhism and various fringe Asian religious practices like Tachikawa-ryu) handed me a manuscript that had been sent to him from an American in Taiwan. The author was engaged in a fairly intensive Daoist meditation and qigong practice, and an even more intensive psilocybin ingestion practice. The manuscript was a relatively detailed account of various amounts of mushrooms being ingested and the effects on his practices. I remember it being very well written, fascinating, and disturbing all at the same time. I wish I'd kept a copy.

This was the same advisor who handed me a copy of The Sacred Mushroom and the Cross, a book insisting that Christianity started off as a hallucinogenic mushroom cult, based on linguistic and iconographical evidence. He was a wild advisor.